Wiseco PK1564 Pro-Lite Forged Piston Kit Bore - 2-Stroke 68.5mm

The Wiseco PK1564 Pro-Lite forged piston kit is a complete top-end rebuild solution engineered for the 1992–1994 Yamaha YZ250 and WR250. Built around a 68.5mm bore (0.50mm overbore), this kit delivers everything needed to restore or upgrade your 2-stroke engine to peak performance.

About the Wiseco Pro-Lite:

The Pro-Lite is Wiseco's benchmark forged 2-stroke piston — the product of decades of racing and engineering experience. Constructed from high-strength forged aluminum, it offers superior durability and heat resistance compared to cast alternatives, while its lightweight design promotes instant throttle response and reduced reciprocating mass.

Key Features:

• Forged aluminum construction for maximum strength and long-lasting durability
• Extra-lightweight piston design engineered for instant throttle response
• Computer-engineered skirt profile minimizes cylinder wall friction for smoother operation
• Anti-detonation grooves and precision ring land diameters eliminate ring blow-by
• 68.5mm bore diameter — standard 0.50mm overbore over stock
• Wiseco part number 677 series design optimized for YZ/WR 250 two-stroke engines

Kit Includes:

• 1 × Forged Pro-Lite piston (68.5mm)
• Piston ring set
• Wrist pin (piston pin)
• Circlips (retaining clips)

Wiseco's Pro-Lite piston kits are a trusted choice among motocross and off-road riders seeking a reliable, high-performance replacement piston that installs easily and performs consistently across a wide range of riding conditions.